<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        td{
            width: 30px;
            text-align: center;
        }
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</head>
<body>
    <table border="1"  style="border-collapse: collapse;">
        <tr>
            <td colspan="12">1</td>
            <td rowspan="13">2</td>
        </tr>
        <tr>
            <td rowspan="13">4</td>
            <td colspan="10">5</td>
            <td rowspan="11">6</td>
        </tr>
        <tr>
            <td rowspan="11">8</td>
            <td colspan="8">9</td>
             <td rowspan="9">10</td>
        </tr>
        <tr>
            <td rowspan="9">12</td>
            <td colspan="6">13</td>
            <td rowspan="7">14</td>
      
        </tr>
        <tr>
            <td rowspan="7">16</td>
            <td colspan="4">17</td>
            <td rowspan="5">18</td>
            <!-- <td rowspan="9">14</td> -->
        </tr>
        <!-- <tr>
            <td rowspan="6">16</td>
            <td colspan="6">17</td>
        </tr> -->
        <tr>
            
        </tr>
        <tr>
            <td rowspan="4">20</td>
            <td colspan="2">21</td>
            <td rowspan="2">22</td>
        </tr>
        <tr>
            <td rowspan="2">24</td>
            <td>25</td>
        </tr>
        <tr>
            <td colspan="2">23</td>
        </tr>
        <tr>
            <td colspan="4">19</td>
        </tr>
        <tr>
            <td colspan="6">15</td>
        </tr>
        <tr>
            <td colspan="8">11</td>
        </tr>
        <tr>
            <td colspan="10">7</td>
        </tr>
        <tr>
            <td colspan="12">3</td>
        </tr>
    </table>
</body>
</html>